Valve-gear.



J. H. GENTRY.

VALVE GEAR.

APPLICATION FILED PBBJZ, 1913.

Patented Oct. 14, 1913.

3 SHEETS-SHEET l.

Hun Eu INVENTOR,

WITNESSES ATTO R N EY :OuJMBlA PLANOGRAPHI 20., WASHINGTON, D. c.

J. H. GENTRY.

VALVE GEAR.

APPLICATION FILED 213.12, 191s.

Patented Oct. 14, 1913.

3 SHEETS-SHEET 2.

lllllll l.|

WITNESS: INVENTOR,

ATTORNEY COLUMBIA PLANOGRAPH C0..wAs! flNOTON. D. c.

J. H. GBNTRY.

VALVE GEAR.

APPLICATION FILED FEB.12, 191s.

Patented Oct. 14, 1913.

3 SHEETS-SHEET 3.

070/112 Gen/27y,

INVENTOR,

WITNESSES ATTORN EY COLUMBI A PLANOORAPH c0.. wAsmfia'roN, D. c.

JOHN HENRY GENTRY, OF GREENTOWN, INDIANA.

VALVE- GEAR.

Specification of Letters Patent.

Patented Oct. 14,1913.

Application filed February 12, 1913. Serial No. 747,975.

To all whom it may concern:

Be it known that I, JOHN H. GENTRY, a citizen of the United States,residing at Greentown, in the county of Howard and State of Indiana,have invented a new and useful Valve-Gear, of which the following is aspecification.

The invention relates to improvements in valve gear.

The object of the present invention is to improve the construction ofvalve gear, and to provide a simple and efficient valve gear, designedfor use on double cylinder engines, and capable of eliminating from suchstructures the usual reverse link and having a slidably mounted radiuslink, adapted to reduce greatly the cost of manufacture and provide afirmer and more solid valve gear.

Another object of the invention is to provide a valve gear of thischaracter, adapted to produce quick opening and closing of the ports,and capable of easy adjustment and of being retained in its adjustmentby the pressure exerted on the pivot-ed end of the radius link.

With these and other objects in view, the invention consists in theconstruction and novel combination of parts hereinafter fully described,illustrated in the accompanying drawings, and pointed out in the claimshereto appended; it being understood that various changes in the form,proportion, size and minor details of construction, within the scope ofthe claims, may be resorted to without departing from the spirit orsacrificing any of the advantages of the invention.

In the drawings :Figure 1 is a plan view of a double cylinder engine,equipped with a valve gear, constructed in accordance with thisinvention. Fig. 2 is a side elevation of the same. Fig. 3 is alongitudinal sectional View, taken centrally through the valve gear.Fig. 4 is a transverse sectional view on the line 4-4 of Fig. 1. Fig. 5is a perspective view of a portion of the valve gear, illustrating thearrangement of the radius links and the bell cranks for connecting theeccentric rods with the valve rods. Fig. 6 is an enlarged transversesectional View of the reverse slide and the guide. Fig. 7 is a sideelevation of the reverse slide and the guide. Fig. 8 is a plan view ofthe same.

Like numerals 'of reference designate corresponding parts in all thefigures of the drawings.

In the accompanying drawings in which is illustrated the preferredembodiment of the invention, the valve gear, which is designed for usein connection with an engine having two cylinders 1, comprises in itsconstruction a pair of inverted radius links 2, connected at theirlowerends by a transverse pivot 3, which is mounted in spacedupwardly-projecting bearings 4 of an arouate reverse slide 5, andconnected with the forward end of a reach rod 6, adapted to move thereverse slide along an arcuate guide 7 to carry the radius links toeither side of the center of the guide fo eversing the engine, and toarrange the ei'fde s ired distance from the center to obtain'the desiredamount of cutoff. The radius links are in a vertical position whenarranged in their central or mid gear position centrally of the guide,which is of a length to permit an equal backward and forward adjustmentof the radius links from such central position. The reach rod 6 isprovided at its forward end with a head 8 extending across the spacebetween the bearings 4, as clearly illustrated in Fig. 4 of thedrawings. The guide 7, which is bolted or otherwise mounted upon theboiler 10 of the engine, is arched transversely to conform to theconfiguration of the boiler, and it is composed of a base or bot-tomplate, vertical longitudinal side webs or flanges 11, and laterallyextending arcuate side flanges 12, projecting outwardly from thevertical webs or flanges at the upper edges of the same. The verticalwebs or flanges 11 are located at the side edges of the base or bottomplate of the guide, and the bolts 13, or other fastening means forsecuring the guide to the boiler, are located in the space between thewebs or flanges 11. The laterally extending arcuate flanges 12 arecurved longitudinally, and the reverse slide, which consists of a curvedplate, conforms to the configuration of and fits the upper faces of thelaterally extending flanges 12 and is of a width coextensive with theguide, as clearly shown in Fig. 6 of the drawings. The upwardlyextending bearings 4, which are preferably which form grooves 01i'*"waystoreceiveathm laterally projecting flanges of the guide. a

Each side piece, which isaapproximately U-shaped in cross section, iscomposed of 5 upper and lower flanges and a vertical web 012% connectingportion, which is provided with vertically elongated: openings or slotsfor the reception of screws 16, which secure the side pieces to the sideedges ofthe reverse 1 slide. The reverse slide is provided with threadedbores to receive titer-screws l6; and the vertical elongation of thebolt'opem ings' or slots ofthe weborconnectirigpOrtionofthesidepiecepermits-a vertical ad- 15 justmentof the latter to takeupthe'wea-r and maintain the bottom flange ofthe'side piece inproperengagementwith the lower face of the laterally extendingflange'of'the guide. Each side pieceisequipped with *spaced adjustingscrews 17 ,2 arranged in threaded openings in thetop flange and bearingagainst the upper face of the reverse i slide A at the side portionsthereoffi' Theadjusting screws are-equipped with lock nuts 18forsecuring them' in their adjustment The-reverse slide obviatesthenecessity of employing reverse links and greatlysimpli fies andstrengthens the construction ofthe valve gear and lessens the cost,ofmanufad turing same, and at the same time provides a more firm andsolid 'valve' gear'than" is possible whenthe radius link is carried by'a reverse link. This construction also en ables the valve gear to beeasilyadju sted, ;"and the arcuate characterofthe'slide 'bal ances theradiuslinks in every adjustment of the same, and the pressureontheradiusi links operating against'the. arcuate reverse' slide and therelative position of the 'same' on the arcua'te'guide Wlll, as hasbeen'found" by-experience, maintaimthe radius link in. its adjustmentwithoutemploying the notch ed segment 19, even' when the engine istraveling at full speed under a maximum load. The rearendofthe'reachxrod shown connected to a lever20, equipped with a springactuated dog 'or deter-it. 21 for' engaging the notched segment 19, butthe notches at the coacting dog or detent are not necessary and may beomitted.

The inverted radius links are pivoted at' their upper ends by pins 22,or other suit-' ablefaste'ning devices to the forward ends of eccentricrods 23, secured at tlieirtrear ends: to straps 24of eccentrics '25andconnected at points intermediate of theirends by suitable pivots 26'to the upper endsof links 27. The links 27, which'exte'nd'tlown Wardlyfrom the eccentric rods, are pivoted at their lower ends by pins 28, orother suit able fastening devices to inner' approximately horizontalrocker arms 29 of "the bell cranks, which'connect the .links with" the;valve rods 30. The. "bell cranks, which'are spaced apart, are composedof the said inner rockenr arms; 29, transversely ali ned. rock shaftsBl,and outer rocker arms 32 extend ing upwardlyifrem thesouter ends of therock shafts 31, and connected at their upper endsby suitable pivots 33with the rear ends of the valve rods 30. The transversely alined rookshafts-31 are ournaled in suitable bearings 34 at opposite sides of theengine. The eccentrics, which are mounted on the crank shaft 35 of theengine, must be set ninety, degrees ahead of th'e-cranks*36; as --thisar rangement isessentialto the operation of the valve gejariWhen-thecrank shaft 'rotates; the backward-sand forwardlongitudinalmovement of 'theeccentric rods-is modi- 8o fieldby-thearcuate movement of the radius link and an up and downIIIOVGHIGIIt'lSlIIP partedto thedepending links 27 for actuating therock shafts and motioniswom municated therefrom through the upwardlyextending: outer rocker" arms to the valve rcds',"-lwhich" are therebyreciprocated. T he ra'diiisadinks; which are connected to theeccent-ric' rodsiatthe inner faces thereof, oper ate in*-th'e n'ature oftoggles to produce an 0" easy up and-down movement of the dependinglinks, which are arranged at the faces of the eccentric 'rods. Byemployingthe inverted radiuslinks,-as pointed out in myprioraPatent,-No.1,022,232, the steam engine is relieved of much ofthe-load incident'to the reciprocati onof the valves, and thelatten areactuatedat theexpenditure' of a minimum" amount of power.

' While the valve gear is shown applied te a :do uble engine; the mannerof= mounting the inverted radius link may-be advantage=- ously' employedin various other "forms of engines, whether of the double cylinderor*single cylinder type.

What is claimed is r 1 The; combination with 1 an "eccentric rod; ofa-valvegear including an inverted radius link connected at its" upperend with the eccentric rod, a reverse slide connected with the 'ldwerend ofthe radius link and form-- ing a support for and carryingthe-same, and' a fixed' guide upon which the'reverse slide" is mounted;

2;- THe-combinationwith an eccentric rod, of a valve gear includingaaninverted radii 1s link",'- a guide, a l reverse slide movable alongtheguide and connected with'and support ing the radius link, andoperating means connected withuand' adapted to move the '126 reverseslide along the guide.

3.-The cornbina-tionwith an eccentr'ic rod,*l.. of' avalve gearincluding an arcuate' guide; an arcuate reverse-'slidemova'ble along theuide, :and "-an' inverted radius link carrie d' by-the reverse slide andconnected 'at its upper endwith' the eccentric rod;'

4. The combinationwith anzeccentric"rod,: of a valve gear includiiiganinverted radius link pi-vote'd directly at its upperend tothe eccentricrod, a reverse slide carrying the radius link, means for guiding thereverse slide, and a bell crank connected with the eccentric rod fortransmitting motion to a valve.

5. The combination with an eccentric rod, of a valve gear including aninverted radius link pivoted directly at its upper end to the forwardend of the eccentric rod, a reverse slide connected with the lower endof the radius link and supporting the same, means for guiding thereverse slide, a link connected to the eccentric rod at a pointintermediate of the ends thereof, and a bell crank for transmittingmotion from the last-mentioned link to a valve.

6. The combination with an eccentric rod, of a valve gear including afixed guide provided at opposite sides with laterally extending arcuateflanges, an arcuate reverse slidefitted against the said flanges andprovided with means for slidably interlocking it with the same, and aradius link pivoted to and carried by the reverse slide and connectedwith the eccentric rod.

7. The combination with an eccentric rod, of a valve gear including afixed guide pr0- vided at opposite sides with laterally extendingarcuate flanges, an arcuate reverse slide fitted against the saidflanges, side pieces arranged at opposite sides of the guide and thereverse slide and secured to one of the parts and slidably embracing theother of such parts, means for adjusting the side pieces to take up thewear, and a radius link pivoted to the reverse slide and connected withthe eccentric rod.

8. The combination with an eccentric rod, of a valve gear including aguide provided with laterally extending flanges, a reverse slide fittedagainst the said flanges approximately U- haped side pieces slidablyembracing the said flanges and the side portions of the reverse slide,means for securing the side pieces to the reverse slide and foradjusting them on the same to maintain them in proper engagement withthe said flanges, and a radius link pivoted to the reverse slide andconnected with the eccentric rod.

9. The combination with a pair of eccentric rods, of a valve gearincluding a guide, a reverse slide mounted on the guide and havingspaced bearings, radius links arranged at the outer sides of the saidbearings and connected with the eccentric rods and provided with aconnecting pivot mounted in the bearings, and a reach rod connected withthe said pivot and arranged between the spaced bearings.

10. The combination with a pair of eccentric rods and valve rods, of avalve gear including a fixed guide, a slide mounted on the guide andhaving bearings, inverted radius links having a connecting pivot mountedin the said bearings of the slide, said radius links being connected tothe eccentric rods, spaced transversely alined rock shafts having innerand outer arms connected, respectively, with the eccentric rods and thevalve rods, and operating means for adjusting the slide.

In testimony, that I claim the foregoing as my own, I have heretoaflixed my signature in the presence of two witneses.

JOHN HENRY GENTRY.

Witnesses:

B. F. GENTRY, TEME L. WILLIAMS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

